U5S

BCBS Prefix U5S

Blue Cross and Blue Shield of Montana

Montana • Medicare Advantage, HDHP, EPO

Billing essentials

Provider phone
(800) 447-7828
Electronic payer ID
MTBLS
Claims mailing address
P.O. Box 660, Billings, MT 59103
Timely filing limit
365 daysCompare all plans
Prior authorization phone
(800) 447-7828
Provider website
https://www.mtblue.com

Coverage under prefix U5S

Medicare Advantage

Medicare Advantage coverage under this prefix means the plan administers Medicare Part A and Part B benefits on behalf of CMS. These claims may have different processing rules than commercial claims, including different prior authorization requirements and appeal timelines. CMS timely filing rules (365 days) typically apply.

HDHP

HDHP (High-Deductible Health Plan) coverage means the member has a higher deductible than traditional plans, often paired with a Health Savings Account (HSA). Most services require the member to pay out-of-pocket until the deductible is met. Preventive care is typically covered before the deductible. Submit claims normally to the payer listed above.

EPO

EPO coverage under this prefix means the member must use network providers but does not need referrals for specialist visits. This plan type is becoming more common as it offers lower premiums than PPO plans while providing more flexibility than HMOs. Verify network status before providing services.

About Blue Cross and Blue Shield of Montana

Independent licensee serving Montana members with commercial, Medicare and Medicaid plans.